A self-supporting solid electrolyte membrane with fibrous network structure for solid state lithium metal batteries
JOURNAL OF POWER SOURCES(2023)
摘要
High ionic conductivity and good interface compatibility have always been two major bottlenecks for solid-state electrolytes. Herein, a composite electrolyte membrane comprising poly (propylene carbonate), PVDF-HFP and Li6.3La3Zr1.4Ta0.6O12 is successfully prepared via electrospinning. With the assistance of succinonitrile, the synthesized solid-state electrolyte exhibits high ionic conductivity (1.32 x 10(-3) S cm(-1) at mom temperature), oxidation potential up to 4.5 V vs Li/Li+ and high Li+ transference number (0.81). This desirable performance is attributed to the combination of PPC with good Li+ conduction ability and PVDF-HFP with excellent mechanical properties, forming a continuous transport framework within the electrolyte. The introduced active fillers and small molecular additive not only benefit to fast Li+ mobility, but also reinforce the stability towards Li metal. Li symmetric cell using the solid-state electrolyte can last for 800 h at a current density of 1.0 mA cm(-2) with a low overpotential. The NCM811 cell using the electrolyte membrane shows high initial discharge specific capacity (184.3 mAh g(-1) at 1 C) and good capacity retention (80.1% after 300 cycles at 30 degrees C).
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关键词
Composite solid electrolyte,High conductivity,PPC,Fibrous network,Self-supporting
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